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State change of Substances

While doing a...

Question

While doing an experiment to determine the boiling point of water, a student heated water in a beaker and observed that when water starts boiling the temperature remains constant. State reason. Where does the heat go? (This is a question from Saraswati Lab Manual Science for class 9 - Chemistry - Experiment :5- DETERMINATION OF MELTING POINT OF ICE AND BOILING POINT OF WATER )

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Solution

1. The temperature remains constant until all the water is converted to gas.
2. The heat is used up by water molecule to break the force of attraction between them and is converted to water in gaseous state. This energy is known as latent heat of vapourisation.

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